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A former Michigan legislator who helped break open the bombshell investigation into an allegedly mob-linked FBI agent told The Post yesterday the G-man’s reputed partnership with a gangster could compromise dozens of convictions.

Stephen Dresch, 62, who spent years investigating the links between agent Lindley DeVecchio and late Colombo crime family boss Greg Scarpa Sr. said 20 or more convictions came from information attributed to Scarpa.

“Almost all the Colombo-war convictions hinged on testimony that originated directly or indirectly from Greg Scarpa Sr.,” said Dresch, who runs an independent investigative firm. “Everything from 1980 that involved Greg Scarpa is potentially fair game here.”

Scarpa died in prison in 1994, and DeVecchio has adamantly denied he helped the mobster.

Dresch said he wrote a letter in early 2005 to the Brooklyn DA investigators suggesting they look at what he called the “DeVecchio-Scarpa connection.”

An assistant DA contacted him a few months later to say they were looking into it, Dresch said.

Calls to DA Charles Hynes’ spokesman were not returned.

Former hit man and mob turncoat Larry Mazza publicly claimed Scarpa successfully called on a law-enforcement insider – whom he referred to as his “girlfriend” – to pull surveillance off of a rival mobster, Nicholas “Nicky Black” Grancio, so Scarpa and his crew could shoot him, according to published reports.

But federal investigators said the Grancio hit was investigated thoroughly and DeVecchio was cleared of any involvement. The sources said the Brooklyn DA is now looking at DeVecchio’s involvement in a different case.

Grancio’s family filed a wrongful-death suit Thursday in federal court against DeVecchio and agent Christopher Favo, who worked with him at the time of the murder.